Bundles in-progress working-tree UI work not authored this session (CoderPane ChatInput migration, AgentComposerBar/CoderMessageList/tab-bar/sidebar/pane refinements, provider icons) with this session's changes to the same files: MessageBubble renders a collapsible 'Thinking' block from reasoning_text/reasoning_parts (surfacing ACP agent_thought_chunk + native reasoning), and the DiffPanel approve/reject calls are repointed to the real /api/coder/pending/:id/apply and /reject routes (the old /sessions/:id/pending/:id/approve|reject paths did not exist).
- useViewport: matchMedia-based hook (no resize polling). Breakpoints
mobile <768 / tablet 768-1023 / desktop >=1024. SSR-safe.
- useSidebarDrawer: Context provider with open/setOpen/toggle + auto-close
on useLocation().pathname change.
- App.tsx: wraps SidebarDrawerProvider around AppShell, renders a
MobileBackdrop (z-30) when the drawer is open on mobile.
- ProjectSidebar: aside is fixed/translate-x-full off-screen on mobile,
slides in (z-40, 200ms transform) when drawerOpen. Inline column on
desktop, unchanged.
- Session.tsx + Project.tsx: hamburger (Menu icon, >=44x44 min) on mobile
opens the drawer. Headers gain paddingTop: max(0.75rem,
env(safe-area-inset-top)) for notch devices. Home.tsx left alone
(sidebar content duplicates the home page).
